A while ago, I mentioned I was doing a poster presentation. Sometime between then and now, I did it. Although there was controversy in comments over whether they are worthwhile, my poster session seemed to me to be wildly successful. I stood by myself awkwardly for about 4 minutes before I hooked my first nerd, and from then on I always had a huge crowd around me. Lots of people seemed interested, and I received a huge number of interesting and helpful questions. It was much more informal than a paper presentation would have been, but it was a much more personal interaction. And I don't know about you, but I find that verbally explaining my work to people is extremely helpful in itself. So I would say that the experience was extremely valuable. Posters are not bullshit.
I don't want to say too much about how my poster was constructed, but I will say that I followed much of the advice I received in the Poster Boy thread. There is a winning formula in there. Thanks to all who advised; my interlocutors and I are in your debt.